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Vice Voca: Verify that the Sum of the Angles of a Triangle is 180° | Lab Manuals for Class 9 PDF Download

Q.1. In a triangle, if the sum of two angles is 60°, then what will be the measure of third angle?

180°-60° =120°.


Q.2. If a triangle has all three angles are equal in measure, then what will the measure of each angle mark?

180°/30° = 60°.


Q.3. What is the angle sum property of a triangle?

The sum of angles of a triangle is 180°.


Q.4. In a triangle, if one of the angles is 80°, then what will be the sum of other angles?

180° – 80° = 100°, Le. the sum of other angles = 100°.


Q.5. What do we mean by scalene triangle?

A triangle whose all the three sides are unequal, is called scalene triangle.

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